Which feature of the Hindu-Arabic numeral system was an improvement over previous numeral systems?

A. the concept of zero

B. the use of prime numbers

c. the development of number lines

D. the creation of multiplication tables

HEL

Greg goes to a high school and observes the way students talk to each other. he makes notes on the words used, the atmosphere of the school and the way the students present themselves to each other. this is an example of a( research method.

Abadger lives in oak grove forest. it is a female and it is four years old. which of the following animals could be considered a member of this badger's population? a. a two-year old male red fox living in oak grove forest b. a ten-year-old female skunk living in pine warden forest c. a four-year-old female badger living in a zoo d. a ten-year-old male badger living in oak grove forest

List out the effects of corruption in nepal plz answer fast plz